49
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Inspection
Inspection
Perform daily and periodic inspection to keep the best pump performance and safety.
Daily inspection
Check the following points. If you notice any abnormal or dangerous conditions, suspend operation immedi-
ately and inspect/solve problems. See the "Troubleshooting" section as necessary.
When wear parts come to the life limit, replace them with new ones. Contact your distributor for detail.
No.
States
Points to be checked
How to check
1 Pumping
• If liquid is pumped.
Flow meter or visual in-
spection
• If the suction and discharge pressure are normal. Pressure gauge
• If liquid has deteriorated, crystallized or settled.
Visual or audio inspection
2
Noise and vibration
• If abnormal noise or vibration occurs. They are
signs of abnormal operation.
Visual or audio inspection
3
Air ingress from the
pump head joints and
the suction line
• If leakage occurs.
• If pumped liquid includes air bubbles, check lines
for leakage and retighten as necessary.
Visual or audio inspection
Periodic inspection
Retighten the pump head mounting bolts evenly to the following torque in diagonal order.
*
Mounting bolts may loosen in operation. How fast the bolts start to loosen is depending on operating conditions.
Tightening torque
Model code
Torque
Bolts
EHN-B11/-B16/-B21
2.16 N•m
M4 Hex. socket head bolt
EHN-B31
2.55 N•m
M4 Hex. socket head bolt
EHN-C16/-C21
2.16 N•m
M4 Hex. socket head bolt
EHN-C31
2.55 N•m
M4 Hex. socket head bolt
EHN-C36
2.55 N•m
M5 Hex. socket head bolt
*
A hexagon wrench can be used for a torque wrench. See page 31.
Summary of Contents for EHN-B11-NAE
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